With the Auger retracted you can easily drive any hopper bottom trailer up beside the hopper auger unit. Once the trailer is stopped, one person can easily extend the auger into position under the trailer. The hopper can be extended or retracted as well as swung side to side to empty from 2 or 3 trailer hoppers. Once the trailer is empty the auger is retracted to allow freedom of movement of the trailer. The controls are mounted by the hopper. There is no need for 2 people, no need to drive and swing at the same time, and it is very difficult to drive over the hopper.